This document is intended for hardware system manufacturers and
software developers of applications, operating systems, or tools. It
contains specification changes, S-specs, errata, specification
clarifications, and documentation changes. The Pentium 4 processor
may contain design defects or errors known as errata which may cause
the product to deviate from published specifications. Current
characterized errata are available on request.

This location contains the most current Specification Update. The
revision number is indicated by the last two digits in its 'pdf' file name.
Specification Updates are revised only as changes occur.